Add bulk sample project values API endpoint

[svarona]

This PR adds a new API endpoint sample-project-values-bulk that allows clients to fetch selected project field values for multiple samples in a single request. This is useful when you need to retrieve project-specific metadata (like protocol, index, etc.) for multiple samples at once.

Changes

• New API endpoint: GET /api/samples/sample-project-values-bulk

  • Accepts a comma-separated list of sample names via samples parameter
  • Accepts optional comma-separated field filter via fields parameter
  • Fields can be matched by name or description for flexibility

• New view function: fetch_sample_project_values_bulk() in wetlab/api/views.py

  • Returns project field values organized by sample
  • Supports filtering by field name OR field description
  • Optimized with select_related() to minimize database queries

• New OpenAPI parameter: sample_project_value_fields for proper API documentation

Use Case

This was made to reduce request from RELECOV to take long times